Golfdom, May 2013

grass was mowed weekly at 20 inches Nitrogen was applied at 20 lbs per 1000 sq ft per year from polymer coated sulfur coated urea 43N 0P 0K in two equal applications in May and September of both years Potassium was applied at 35 lbs per 1000 sq ft per year from potassium sulfate 0N 0P 415K in two equal applications in May and September of both years Irrigation was provided to prevent drought stress The experiment was arranged in a split plot design Raking was the whole plot treatment and herbicide was the subplot treatment Herbicide treatments included Tenacity at 08 and 10 oz a i per acre applied singly and three times sequentially on a two week interval with 025 percent v v non ionic surfactant R 11 or 025 percent v v non ionic surfactant plus 25 percent v v UAN solution that contained 28 percent N Table 1 The first treatment in 2007 was applied on August 17 and the first treatment in 2008 was applied on July 24 The single treatment was applied at the same time as the first application of the sequential treatments The herbicide was applied with a backpack sprayer IMPROVING TENACITY TABLE 1 Treatment list for creeping bentgrass control with Tenacity at different rates timing and adjuvant Tenacity oz a i acre Non ionic surfactant NIS 0 025 0 3 0 025 25 3 08 025 0 3 08 025 25 3 1 025 0 3 1 025 25 3 24 025 0 1 24 025 25 1 3 025 0 1 3 025 25 1 pressurized with carbon dioxide at 36 psi and equipped with flat fan nozzles at 19 inches spacing held about 18 inches above the soil surface to deliver a spray volume of 10 gal per acre The raking treatment was applied using a power rake set at 12 inches height prior to the first herbicide treatment and weekly thereafter The clippings were manually collected and removed using a spring rake Creeping Urea ammonium nitrate UAN Applications no bentgrass control was visually evaluated weekly after the first treatment based on a 0 to100 scale Camper 1986 where 0 equals no effect 1 to 30 equals slight 31 to 60 equals moderate rating above 30 considered unacceptable injury 61 to 99 equals severe injury and 100 equals complete death Evaluation of creeping bentgrass survival also was conducted on May 29 2008 and May 14 2009 Continued on page 36 May 2013 Golfdom 35 Golfdom com

View the Covers and the Table of Contents pages from every issue of this publication, all gathered together for easy browsing. Just flip pages and zoom as you normally do to see each issue's Cover and Table of Contents, then follow links directly to interesting content.